If you have a specific article in mind there are a few ways you can go about finding it.
The most effective way to do this is to identify the Journal Title, and enter it under the Journals tab on the library homepage.
This will give you an alphabetical list of journals that tells you where and in what format we own that journal
Select an option that covers the date you're looking for.
At this point you can either browse by volume, issue and page number, or "Search for articles within this publication" for a title or other citation information.